Get extreme! Take your workouts to the next level with the Urban Rebounding Extreme Metabolic Training - 13 DVD Set. These are some of the most fun and challenging workouts ever created! 7 top instructors lead 90 workout programs, some using a mini-trampoline (not included). About Urban Group ExerciseJB Berns, whom Fitness Magazine called one of America's Top Personal Trainers, created Urban Group exercise to bring efficient exercise and health awareness to homes nationwide.